DCOA Mixed Practice Test #145

Question 1

Study of fossils:‌​‍

Accepted Answer

Palaeontology — Palaeontology.‌​‍

Answer

Ecology

Answer

Geology

Answer

Archaeology

Question 2

Test cross:‌​‍

Accepted Answer

Cross with homozygous recessive — To determine unknown genotype.‌​‍

Answer

With dominant

Answer

Random

Answer

Self cross

Question 3

Distance between (x₁,y₁) and (x₂,y₂):‌​‍

Accepted Answer

√[(x₂-x₁)² + (y₂-y₁)²] — Pythagorean theorem. In 3D: add (z₂-z₁)².‌​‍

Answer

x₂+y₂

Answer

y₂-y₁

Answer

|x₂-x₁|

Question 4

Sabarimala SC Verdict (2018):

Accepted Answer

Allowed all women — All age women allowed; issue under review by larger bench.

Answer

Banned all

Answer

Restricted

Answer

No change

Question 5

During a Teachers' Day celebration on September 5th, a district education officer addresses a gathering of teachers. Which of the following messages would best resonate with the core philosophy behind observing this day in India?

Accepted Answer

B. Stressing the importance of teachers as mentors who shape character and instill values, beyond just imparting knowledge. — Teachers' Day in India, celebrated on September 5th, honors the birth anniversary of Dr. Sarvepalli Radhakrishnan, India's second President and a renowned philosopher and educationist. He believed that teachers should be the best minds in the country and emphasized their role in shaping character and moral values, making option B the most fitting message. While other options relate to important educational aspects, they do not capture the specific essence of Dr. Radhakrishnan's philosophy tied to this day.

Answer

A. Encouraging teachers to focus on integrating technology for a digital-first learning experience.

Answer

C. Advocating for increased government funding and infrastructure development in rural schools.

Answer

D. Reminding teachers of their role in promoting scientific temper and critical thinking among students.

Question 6

The 'Venice of the East' is:‌​‍

Accepted Answer

Alappuzha — Alappuzha is called the 'Venice of the East' due to its network of backwaters and canals.‌​‍

Answer

Kochi

Answer

Kollam

Answer

Kozhikode

Question 7

A male patient enquires about sildenafil for erectile dysfunction. Which of the following co-existing medication classes would be an absolute contraindication for sildenafil use due to severe risk of hypotension?

Accepted Answer

C. Nitrates — Sildenafil is a phosphodiesterase-5 (PDE5) inhibitor that enhances the effects of nitric oxide. Concomitant use with nitrates (e.g., nitroglycerin, isosorbide dinitrate) can lead to a dangerous and life-threatening drop in blood pressure (severe hypotension) due to synergistic vasodilation.

Answer

A. Beta-blockers

Answer

B. Alpha-blockers

Answer

D. Calcium channel blockers

Question 8

The Nobel Prize in Literature 2023 was awarded to:‌​‍

Accepted Answer

Jon Fosse — Norwegian writer Jon Fosse won the 2023 Literature Nobel for his plays and prose.‌​‍

Answer

Louise Glück

Answer

Abdulrazak Gurnah

Answer

Annie Ernaux

Question 9

The ratio of sines (Snell's law) stated in terms of angles: n₁ sin θ₁ = n₂ sin θ₂ implies when light enters a denser medium, the angle:

Accepted Answer

Decreases (bends toward normal) — Going rarer→denser, refracted ray bends toward the normal.

Answer

Increases

Answer

Stays same

Answer

Becomes 90°

Question 10

What is the basic structure of immunoglobulins (antibodies)?‌​‍

Accepted Answer

4 chains (2 heavy + 2 light) in Y-shape — 5 classes: IgG (most abundant), IgA (secretions), IgM (first response), IgE (allergy), IgD. ‌​‍Antigen-binding site at tips of Y.

Answer

One chain

Answer

No structure

Answer

2 chains

DCOA Mixed Practice Test #145